Add a MathFloor stub generated with TurboFan

test/mjsunit/compiler/stubs/floor-stub.js

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 //
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --max-old-space-size=60 --check-handle-count
+// Flags: --allow-natives-syntax --expose-natives-as=builtins --noalways-opt
 
-table = [];
+const kExtraTypeFeedbackMinusZeroSentinel = 1;
+const kFirstSlotExtraTypeFeedbackIndex = 5;
 
-for (var i = 0; i < 32; i++) {
- table[i] = String.fromCharCode(i + 0x410);
-}
-
-
-var random = (function() {
-  var seed = 10;
-  return function() {
-    seed = (seed * 1009) % 8831;
-    return seed;
-  };
+(function(){
+  var floorFunc = function() {
+    Math.floor(NaN);
+  }
+  // Execute the function once to make sure it has a type feedback vector.
+  floorFunc(5);
+  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
+             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
+                            kFirstSlotExtraTypeFeedbackIndex));
+  assertEquals(5.0, builtins.MathFloor_STUB(floorFunc, 4, 5.5));
+  assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
+             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
+                            kFirstSlotExtraTypeFeedbackIndex));
+  // Executing floor such that it returns -0 should set the proper sentinel in
+  // the feedback vector.
+  assertEquals(-Infinity, 1/builtins.MathFloor_STUB(floorFunc, 4, -0));
+  assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
+               %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
+                              kFirstSlotExtraTypeFeedbackIndex));
+  %ClearFunctionTypeFeedback(floorFunc);
 })();
-
-
-function key(length) {
-  var s = "";
-  for (var i = 0; i < length; i++) {
-    s += table[random() % 32];
-  }
-  return '"' + s + '"';
-}
-
-
-function value() {
-  return '[{' + '"field1" : ' + random() + ', "field2" : ' + random() + '}]';
-}
-
-
-function generate(n) {
-  var s = '{';
-  for (var i = 0; i < n; i++) {
-     if (i > 0) s += ', ';
-     s += key(random() % 10 + 7);
-     s += ':';
-     s += value();
-  }
-  s += '}';
-  return s;
-}
-
-
-print("generating");
-
-var str = generate(50000);
-
-print("parsing "  + str.length);
-JSON.parse(str);
-
-print("done");